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Finding the Third Proportional to 397.50 and 861.75

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Solution

The third proportional to 397.50 and 861.75 is: 1,868.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.50 : 861.75 = 861.75 : x
  2. Step 2: Convert to fraction form
    397.50/861.75 = 861.75/x
  3. Step 3: Cross multiply
    397.50x = 861.75 × 861.75
  4. Step 4: Simplify right side
    397.50x = 742,613.06
  5. Step 5: Solve for x
    x = 742,613.06/397.50
  6. Step 6: Final answer
    x = 1,868.21

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.